me_irl

i always recommend mindfulness in plain english by by Bhante Gunaratana as a start. not sure what you mean by "nonsense," but this book is just method: how to let go of things and find peace, where before we wouldn't even realize we just spent the whole day dwelling on something that irked us that morning, and can't figure out why we're so pissed off at bedtime. we're not paying enough attention to realize we're not paying enough attention. it sounds like a simple thing to fix but it's not remotely easy--people spend lifetimes working on this.

because psychology and mental processes are so subjective, it's different for everyone--the "facts" you'll find will be personal testimonies (thousands of years' worth). but there are studies if that makes it more "valid" for you.